A Fluid Built for Multiple Vacuum Applications
Some specialty chemicals serve only one narrow purpose, but the most valuable industrial fluids are those that can perform reliably across different environments. Silicone Diffusion Pump Oil IOTA 705 belongs to this broader category. It is a colorless, transparent, single-component diffusion pump fluid designed for ultrahigh vacuum applications, yet its usefulness extends across electronics, optics, metallurgy, plastics, research, and analytical instrumentation. This versatility is one of the main reasons it appeals to both laboratory users and industrial operators.
Performance Range and Chemical Identity
IOTA 705 is chemically associated with pentaphenyl trimethyl trisiloxane and CAS No. 3390-61-2. Its synonyms include 1,1,3,5,5-pentaphenyl-1,3,5-trimethylsiloxane, 705 super high vacuum diffusion pump oil, 705 diffusion pump fluid, phenylmethylsiloxane oligomers, and oil for diffusion pump. These names reflect its identity as a high-performance silicone fluid for vacuum pumping applications.
The fluid is designed for ultrahigh vacuum service in the range of 5×10⁻⁹ to 10⁻¹⁰ torr (untrapped), with an ultimate vacuum capability of 1×10⁻⁹ to 10⁻¹⁰ torr (untrapped). Its extrapolated vapor pressure at 25°C is 3×10⁻¹⁰ torr, indicating that it is suitable for applications where low vapor contribution is essential.
Silicone Diffusion Pump Oil IOTA 705 （Replacement for DC705）-IOTA
